Mixing-valve.



W. J. BERGENS.

MIXING VALVE.

APPLICATION 1mm MAY 13, 1912.

Patented May 13, 1913.

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WILLIAM J. 'BERGENS, OF CLEVELAND, OHIO, ASSIGNOR 0F ONE-FOURTH TO CABLE- TON L. TERRY AND ONE-FOURTH T0 JOHN A. BOMMHABD'I, BOTH OF CLEVELAND, OHIO, AND ONE-HALF TO THE SINGLE I AUCET COMPANY, 'OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

Specification oi Letters Patent.

Application filed May 13, 1912. Serial No. 697,047.

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' Patented May 13, 1913.

To all whom it may concern Be it known that I, WILLIAM J. Bnnonns,

a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and The object of the invention is to provide improved means for preventing scalding, by a construction which will prevent the deliver of hot water alone, and also by means of w ich the roportion of hot water may be limited un er all conditions.

A further object of the invention is to provide an improved construction with respect'to the index plate, whereby it may be easily changed according to local circumstances. r

A further object of the invention is to improvethe details of a mixing valve in the particulars more fully indicated in the following specification.

In the drawings-Figure 1 is a plan view of the valve, parts being'removed to show the cam. Fig. 2'is a sectlon on the line 2-2 of Fi 1.

Referring specifically to the drawings, 14 indicates the central casing formin a chamher which contains the cam 17. T is chamber is separated by the side wall of the casing from a cored passage 33 which communicates at its opposite ends with the hot and cold water inlet pipes 21, and intermediately with the outlet pipe 22. The cam 17 is mounted on a spindle 20 which has a bearing at 32 in the bottom of the casing, and atits outer end carries a-handle 16 whereby it may be turned. The cam chamber is closed at the top by a bonnet 24 screwed against a shoulder 13 on the wall of the casing and the spindle 20 has a tapered shoulder at '19 against which the bonnet 24 rests to hold the spindle in position. a

12 1s an index plate shaped to fit in a re- I cess or rabbet 23 in the top of the casin and this index plate has a hole throug which the sleeve or neck 35 of the bonnet 24 extends. A nut 15 is screwed on this neck, above the index plate, and is provided with packing 26, and the inner end of the nut is counterbored to form ahseat for thecoiled sprlng 25 which presses on the index plate 12 and holds the same in position irrespective of the position of the stufiing nut 15, so that the plate is held to its place without looseness. Ke s 23" may be inserted to revent turn or s ift of the index plate w ich is provided with marks corresponding to the shape of the cam. The pipes 21 inclose the stems 18 of the inlet valves the inner ends of which work through openings in the wall of the casing 14, to contact with the cam 17. Projections 27 and 29 on the valve of which closes against a seat 7, under the pressure of a coiled spring 5.

4 is a screw plug havin a threaded bore which receives a screw p ug 3 which acts as a stop to limit the rise of the check valve 8, the stem 6 of the check valve working in the bore of the plug 4 and adapted to strike the stop 3. A cap 1 is screwed onto the plug1 4.

T e check valves serve two purposes: One is to prevent internal circulation in consequence of the difi'erence in pressure of the hot and cold water, and the otheris to permit'adjustment to regulate the proportion of hot water admitted. When the hot water supply is maintained at a high temperature the sto 3 may be screwed in to permit only a smal o ning of the check valve on the hot water mlet side, so that by no possibility can the temperature of the fluid served become sufficiently hot to scald.

The shape of the cam 17 is such that the cold water valve (indicated on the right in the drawing) is opened first, and as the cam is turned this is followed by the opening of water valve stem at the limit of movement so that the cam cannot be turned to bring the cold water valve stem. beyond the high mounted on the casing,

point of the cam.- ,By varying the shape of the'cam the proportions can be varied and therefore the index plate 12 is made easily removable so that another can be substituted, for example in case it should be desired to'deliver cold, warm or hot water.

*What I claim as new is:

1.In a mixing valve, the combination with a valve casing, a valve-operating device including a spindle extending into the easing, a bonnet 'on the casing, an index plate an outer packing nut surrounding the spindle, a connecting sleeve between the packing nut and the bonnet, said sleeve extending around the spindle and through the index plate, and means engaged by the packing nut to confine the index plate to the casing. 2. In a nnxingvalve, the combination of a casing, projecting outwardly, -valve operatin devices located in the casing and including a spindle: extending through said sleeve, an

a bonnet thereon having a sleeveoon-me index plate mounted on the casing and surrounding said sleeve, a packing nutscrewed on the sleeve around spring between the packing nut and the index plate. 1 p

3. Ina mixing valve the combination of a valve casing having a central chamber, a bonnet screwed into the casing and forming the top of said chamber and having an outwardly projecting sleeve, valve operating devices located in the chamber and including a spindle extending through said sleeve and retained 'by the bonnet, a packing nut around the spindle on the outer end of the sleeve, and an indexv plate confined between the nut and the bonnet.

In testimony whereof, I do aflix my signature in presence of two witnesses.

WILLIAM J. BERGENS. Witnesses: 7

JOHN A. BOMMHARDT, STEDMAN J. Bocxwnm. I

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